---
title: pipeRadius
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scntorus/piperadius
---

# pipeRadius

The minor radius of the torus, defining the pipe that encircles the torus ring. Animatable.

## Declaration

```swift
var pipeRadius: CGFloat { get set }
```

## Discussion

Discussion In the definition of a torus as a surface of revolution, the pipe radius defines a circle that is rotated around an axis (the Y axis of the torus’ local coordinate space). Rotating the circle around this axis makes it follow a circular path (whose radius is defined by the ringRadius property) and creates the surface of the torus. The default pipe radius is 0.25. A pipe radius of zero or less creates an empty geometry. You can animate changes to this property’s value. See Animating SceneKit Content.

## See Also

### Adjusting a Torus’ Dimensions

- [ringRadius](scenekit/scntorus/ringradius.md)